Evidence map›Paper›PMID 27466052›Full record

ArticleScientific reports2016

Cognitive differences between orang-utan species: a test of the cultural intelligence hypothesis.

Sofia I F Forss, Erik Willems, Josep Call, Carel P van Schaik

Abstract read
In one paragraph

Article in Scientific reports, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 22 papers.

0numbers the graph read from it
0cells of the map it votes in
22citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

22 citing papers in PubMed.

  1. Review
  2. Article
  3. Brokering peace in the ape (culture) wars.Evolutionary human sciences · 2026
    Article
  4. Inhibitory control tests in non-human animals: validity, reliability, and perspectives.Biological reviews of the Cambridge Philosophical Society · 2025
    Review
  5. Article
  6. Article
  7. Article
  8. What made us "hunter-gatherers of words".Frontiers in neuroscience · 2023
    Article
  9. Article
  10. Article
  11. Animal cognition in an urbanised world.Frontiers in ecology and evolution · 2021
    Article
  12. Article
  13. Chimpanzees' (PeerJ · 2020
    Article
  14. Article
  15. Review
  16. Article
  17. Article
  18. Article
  19. Article
  20. Review
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors.

Sofia I F ForssAnthropological Institute &Museum, University of Zurich, Switzerland.
Erik WillemsAnthropological Institute &Museum, University of Zurich, Switzerland.
Josep CallSchool of Psychology and Neuroscience, University of St. Andrews, United Kingdom.
Carel P van SchaikAnthropological Institute &Museum, University of Zurich, Switzerland.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Cultural species can - or even prefer to - learn their skills from conspecifics. According to the cultural intelligence hypothesis, selection on underlying mechanisms not only improves this social learning ability but also the asocial (individual) learning ability. Thus, species with systematically richer opportunities to socially acquire knowledge and skills should over time evolve to become more intelligent. We experimentally compared the problem-solving ability of Sumatran orang-utans (Pongo abelii), which are sociable in the wild, with that of the closely related, but more solitary Bornean orang-utans (P. pygmaeus), under the homogeneous environmental conditions provided by zoos. Our results revealed that Sumatrans showed superior innate problem-solving skills to Borneans, and also showed greater inhibition and a more cautious and less rough exploration style. This pattern is consistent with the cultural intelligence hypothesis, which predicts that the more sociable of two sister species experienced stronger selection on cognitive mechanisms underlying learning.

Indexed as

CognitionAnimalsAnimals, ZooBehavior, AnimalFemaleIntelligenceMalePongo abeliiPongo pygmaeusSpecies Specificity

Identifiers

PMID27466052
PMCPMC4964338

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.